Foam Flotation Treatment of Industrial Wastewaters: Laboratory and Pilot Scale

摘要

A floc foam flotation pilot plant reduced lead and zinc in dilute solution to very low concentrations. The results suggest a number of design improvements. A simple diffusion model does not adequately describe axial dispersion at high column leadings. The floc foam flotation of zinc, cobalt, nickel, chromium (III), and simple and complexed cyanides was carried out. Modified procedures make floc foam flotation of copper compatible with several precipitation pretreatments. The flotation of ferric hydroxide flocs is profoundly affected by polyvalent anions such as silicates and phosphates. The flotation of mixtures of copper, lead and zinc was successfully carried out. A surface adsorption model for floc foam flotation was analyzed and found to account for the effects of ionic strength, specifically adsorbed ions, surfactant concentration, and surfactant hydrocarbon chain length.